/* Copyright 2012 The Netty Project
 * 
 * The Netty Project licenses this file to you under the Apache License, version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at:
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License. */
package io.netty.example.objectecho;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

import java.util.ArrayList;
import java.util.List;

/**
 * Handler implementation for the object echo client. It initiates the ping-pong traffic between the object echo client
 * and server by sending the first message to the server.
 */
public class ObjectEchoClientHandler extends ChannelInboundHandlerAdapter {

	private final List<Integer> firstMessage;

	/**
	 * Creates a client-side handler.
	 */
	public ObjectEchoClientHandler() {
		firstMessage = new ArrayList<Integer>(ObjectEchoClient.SIZE);
		for (int i = 0; i < ObjectEchoClient.SIZE; i++) {
			firstMessage.add(Integer.valueOf(i));
		}
	}

	@Override
	public void channelActive(ChannelHandlerContext ctx) {
		// Send the first message if this handler is a client-side handler.
		ctx.writeAndFlush(firstMessage);
	}

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) {
		// Echo back the received object to the server.
		ctx.write(msg);
	}

	@Override
	public void channelReadComplete(ChannelHandlerContext ctx) {
		ctx.flush();
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		cause.printStackTrace();
		ctx.close();
	}
}
